clean up the easy clippy errors

I'm still not running clippy on CI and probably should.
There are a few left that were a little more involved to address.

server/db/upgrade/v0_to_v1.rs

@@ -221,7 +221,7 @@ fn update_camera(
       update camera set next_recording_id = :next_recording_id where id = :id
     "#,
     )?;
-    for (ref id, ref state) in &camera_state {
+    for (ref id, state) in &camera_state {
         stmt.execute(named_params! {
             ":id": &id,
             ":next_recording_id": &state.next_recording_id,